Influence of slope on subsurface drainage of hillsides
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Hillside drainage was investigated using numerical solutions to the two‐dimensional form of the Richards equation for combined unsaturated and saturated flow. The objectives of the study were to examine the influence of slope on drain flow rates and water table depths in the center regions of sloping hillsides. Solutions were obtained for slopes 135 m long, containing parallel drains spaced 30 m apart and located l m below the surface in 3‐ and 7‐m‐deep profiles. Drainage under steady infiltration and for transient conditions was simulated on slopes of up to 0.40 m/m using two soils. Small slopes (≤0.15 m/m) were found to have little effect on drain flow rates and water table depths in the center of the region, indicating that drainage theory developed for flat land can be used for interior parallel drains on these slopes. Copyright 1989 by the American Geophysical Union.
author list (cited authors)
Fipps, G., & Skaggs, R. W.